Is it possible to retrofit a cobra-style sag lens roadway luminaire?
‘Cobra-style’ luminaire or ‘cobra-head’ is a slang term describing the rounded housing that is mounted on an extended arm, which resembles a cobra. Other fixture types include ‘shoeboxes’, discs and cylinders. If a ‘sag-lens cobra-style’ luminaire is made by GE, a ‘hula skirt’ shield can be used. The North Texas Toll way Authority (NTTA) installed some of these Dallas North Toll way north and south of Beverly Drive. They can be ordered for about $30 from GE; however if the luminaire is 8 to 10 years old, it would be cheaper to install a full cut-off street light, since the average life of the ballast transformer inside the fixture is 8 to 10 years, and you have to figure in the cost of labor. A new cobra-style luminaire may cost about $195. You might ask your city to specify full cutoff street lights to use for replacements.
